Gas-check for inclosed-arc lamps.



No. 678,343. Patented luly 9. |90I.

P. LUHR.

GAS CHECK FDR INCLDSEUARC LAMPS. v

('Applcstion lod Sept. 15, 1900.)

(llo Modal.) 2 Shoah-Shoot I.

No. 678,343. Patented my 9, mul.

P. Luna.

GAS CHECK F03 INCLUSED ARB LAMPS.

' (Applimion am sepn 1u. moo.) (lo Modal.) A- 2 Sheets-Sheet 2.

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UNITED STATESL PATENT OFFICE.

PHILIP LUHR, OF ORANGE, NEW JERSEY, ASSIGNOR TO MANHATTAN GENERAL CONSTRUCTION COMPANY, OF NEW YORK, N. Y.

GAS-CHECK F-oR lNcLosED-ARC LAM Ps.

SPECIFICATION-orming part of Letters Patent No. 678,343, dated J' uly 9, 1.901. .Application Med-September 15, 1900. Serial No. 30,105. (No model.)

' scribed in that application, the present gascheck is provided with an annular chamber for the purpose of accumulating the heat radiated from the, inside of the bulb.

The present invention contemplates, in distinction from that covered by the application aforementioned, the employment of a gascheck which is preferably of larger size than the diameter of the inclosing bulb, the object being to secure a higher concentration of heat at the center of the lamp structure by reason of the fact that the projecting outer portions of the gas-check are affected by the currents of heated air between the outer lampglobe and the inner bulb, which incloscs thev My invention is further differentiated from the earlier one by the employment of a larger number of semicircular channels, through which the air and gases are made to pass, and also by the use,of anl inner chamber made of a movable block of porcelain, lava, or like heat-resisting material. This chamber is usually made adjustable from side to side to allow for variation in lining up and for crooked carbons. The block in which the charnber is located is perforated, so that the air can pass from it into the annular chamber above mentioned,and is provided with a shoulder which bears by gravity on the upper side of the lower lamp-plate. In this way the block constituting the chamber is made easily removable, as'will appear later on.

My invention is also concerned with the matter of providing an elastic support for the inner inclosing bulb surrounding the lampcarbons.

In one forni of my gas-check the gases pass out at opposite sides and circulate first in reverse directions, afterward intermingling and making exit at ports which may be located in the bottom of the gas-check, whereby the weakening of the wall of the gas-check is prevented. ln another form the air is admitted at opposite sides and circulates in reverse direction through rentrant semicircular ducts or channelsin the two halves of the gas-check,

4its passage being obstructed'by projecting lugs. In another form the entrances for the gases and the air are on the same side, the circulation bein gcarried on through two channels forming almost complete circles. In a fourthform two exit-passages for the gases are provided, with only one inlet-passage for the air, the circulation of the gases in one instance being from the center through semicircular ducts to the air-entrance and in the other instance through a semicircular duct in one direction and through an almost completel'y circular duct in the reverse direction. The details of my invention will be clearly understood by reference to the accompanying drawings, in Which- Y Figure 1 is a side elevation of an inclosedarc lamp containing my invention, some of the parts being shown in section. Fig. 2 is Va section along the line 2 2 in Fig. 1 looking downward. Fig. 3 is a section along the line 3 3 in Fig. 2. Fig. 4 is a plan of the first form of gas-check described above. Fig. 5 is a similar view of the second form. Fig. 6 is a similar view of the fourth form. Fig. 7 is a similar View of the third form; and Fig. 8 is a plan of the elastic support for the glass bulb, the side rods being shown in section along the line 8 8 in Fig. 1

Referring to the drawings in detail, 1 is a portion of the frame of an inclosed-arc lamp, and 2 2 are posts depending from the said frame and supporting a plate 3,-which constitu tes the lowermost plate or trim-plate of what maybe called the upper lamp-frame. To the framel screws 4 4 are applied for supporting the outer lamp-globe 5. The said globe is provided with a projecting iiange or rim 6, by means of which it is supported upon the screws 4: 4 in a manner well understood. The plate 3 is secured to the posts 2 2 by suitable sockets 7 7, which sockets are perforated,

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as shown in Figs. 1 and 2, to receive springcotters 8 S, having eyes which surround the side rods 9 and 10 of the lamp. These side rods are screw-threaded at their upper ends and pass freely through the eyes of the springcotters, above which they are adjustably held by nuts 1l 11. The side rods 9 and 10 are sufficiently elastic to be drawn apart at their upper ends, whereby they can be detached from the sockets 7 7 at will. By a reverse action they can be connected thereto, as will be readily understood.

The rods 9 and 10 may be formed of one continuous piece of metal, and I generally prefer that this metal should be of angular cross-section. To the lower part of the side rods I secure a button 12, which has an angular opening 13, corresponding in shape to the angle of the side rods. By means of a set-screw 14 I secure the button 12 to the lower end of the side rods 9 and 10. The lower end of the button 12 is riveted into a star-shaped washer 16, which constitutes a backing for a star-shaped crown-support 17. The latter is punched out in star shape in the first instance and then bent over to form six springy supporting-tips with a hollow center or saddle, in which the lamp-bulb 1S is seated. Inasmuch as the lower part of the bulb is formed on the arc of a circle and inasmuch as the side rods 9 and l0 can be swung freely in or out within the eyes ofthe @otter-pins S 8, it is clear that the glass bulb 18 may be readily seated in the crown-spring 17 by a proper manipulation of the side rods and the crown-spring connected therewith. The spring tips or bends of the crown-support 17 holdl the bulb evenly without any sharp edge or point cutting into the glass. The contacts ot' the support are made at six points. Inasmuch as the crown-spring is punched out of light sheet-steel, the pressure on the glass is materially reduced. lVith this device the lamp may be turned o n with the arc burning in the lower portion of the inclosing chamber, even in cold weather, without shattering the bulb. The tips heat up evenly with the glass and allow for expansion. It desired, the side rods themselves may have considerable elasticity, and so as sist in relieving-the strain upon the glass.

The bulb 18 is pressed by the elastic support above described against a shoulder 19 on the gas-check 20. The said gas-check is provided with lugs or extensions 21 21, to which are secured by anysuitable means the angular rods 22 22, which support the lower carbon 23 in line with the upper carbon 24.

The supporting means for the lower carbon may be a clamp 25, provided with a movable stirrup 26, which is capable of being moved aside to admit the carbon or moved down to support the carbon, as the case may be.

Immediately surrounding the upper carbon 24 is a block 27 of porcelain or lava or some other good heat-resisting material. In the lower end of this block is formed a chamber 28, from which passages 29 29 lead to an annular chamber 30 between the block 27 and the inner walls of the gas-check 20. The openings 29 29 will usually be located in proximity to the rods 22 22 and alsoin proximity to the air-inlet passages 3l and 32 in the interior of the gas-check proper. The object of this arrangement is to create a local circulation in the upper part of the bulb 18, whereby a rapid intermingling of the air and the gases of combustion takes place locally without causing too rapid a descent of the air to the region where the arc is burning.

The special structure ot' the gas-check is illustrated in Figs. 3, 4, 5, 6, and 7. Fig. 4 shows exits for the gases on opposite sides, channels 33 33 for the gases, lugs 34 34 for obstructing the iiow, and ports 41 41 in the bottom of the gas-check. Fig. 5 illustrates a construction in which the gases circulate in reverse directions through the 0pposite halves of the check, the channels through which they pass being shown at 33 33. In these channels lugs 34 34 are interposed for preventing too-rapid circulation. It will be observed that in this structure the channels are, so to speak, rentrant and generally semicircular in shape. In Fig. 7 the air and the gases pass through two channels 33 33, which are almost completely circular, there being but one entrance and one exit passage for the airand the gases. Luge 34 34 are present, as before, for preventing too free a circulation. In Fig. G the gases from one port pass through only one half of the gas-check in order to reach the final exit, and from the other port they pass in one direction through the opposite half of the gascheck and in the other direction through nearly all ot' both halves thereof.

In the described construction a considerable amount of metal is located at or near the top of the inner lamp-bulb, resulting in the concentration of heat at this point,which concentration is assisted by making the gascheck overlap the Lipper rim of the bulb to a considerable extent. The heated gases rising from the exterior of the bulb strike the overlapping portion of the gas-check and are there transformed into local heat at the top of the gas-check. The block 27 may be made adjustable laterally to some extent, and thereby allow for Variations in lining up and for crooked carbons.

Convenient means for clamping the gascheck to the lower plate of the lamp are illustrated in Figs. 2 and 3, the same consisting of pins 35, held by nuts 3G in lugs or extensions 37 on-the gas-check. These pins are provided with flanges or catches 38, adapted to ride and bind upon beveled segments 39 on the lower plate 3. By turning the catches in one direction or the other the gas-check can be readily clamped to the plate 3 or released from engagement therewith at will.

rlhe enlargement of the gas-check for the ICO IIC.

purposes already described gives room for the employment of return or rentrant channels for the mixing of the air and gases.

Should an explosion take place within the inner bulb, the block 27 will be lifted and allow the gases to'escape quickly in case the channels in the gas-check should not be sufficient for this purpose.

The non-conducting central block 27 furnishes good protection against arcing when the carbone are burning in the upper part of the inclosing bulb.

By making the lower and weaker part of the lamp detachable it is easier to ship and handle the lamp without breaking it and the length of the shipping-boxes can be decreased. This characteristic of my lamp also contributes to the easy cleaning of the parts, as also does the fact that the central vblock can readily be lifted out.

The thread upon the upper ends ofthe side rod is preferably made only in the angles of the said rods, whereby the binding of the nuts due to rust or to heat is avoided. I

The employment of spring-cotters for making the connection between the side rods and the plate 3 allows the said plate to be made round and reduces the breakage which takes place when this plate is provided, as is usually the case, with projecting lugs, by means of which connection is made with the lower partof the lamp.

The invention claimed is- 1. A gas-check for inclosed-arc lamps containing substantially unifornn reverse or reentrant chambers for the circulation of the gases, the said chambers being obstructed at selected points by lugs.

2. A gas-check for inclosed-arc lamps comprising a ring of metal containing suitable channels for the gases, a .hub of insulating heat-resisting material supported within the said ring so as to form an annular chamber outside the hub, the lower portion of the hub being formed into a chamber around the upper carbon, and one or more channels or passages leading from the inner chamber to the annular chamber.

3. In an inclosed-arc lamp, a pair of side rods outside the inclosing bulb of the lamp, a trim-plate constituting the lower part of the upper lamp structure, the said trim-plate being perforated, in combination with spring-` cotters connecting the side rods to the trimplate.

4. In an inclosed-arc lamp, a pair of carbons, a transparent bulb surrounding the same, a gas-check at the top of the said bulb, a trim-plate constituting the lower part of the upper lamp structure, a pair of side rods outside the bulb, a pair of spring-cotters connecting the side rods to the trim-plate and nuts for adjusting the position of the side rods.

5. The combination with the side rods of an inclosed-arc lamp, of a trim-plate for supporting the said side rods and apair of spring- 'cotters connecting the side rods to the trimplate, the said spring-cotters being provided with eyes through which the side rods freely pass.

6. An elastic support for the glass bulb of an inclosed-arc lamp, consisting of a number of springs bent over, as shown, and pressing against the lower end of the bulb.

7. An elastic support f or the glass bulb of an inclosed-arc lamp consisting of a star'- shaped'piece of elastic material bent over under the lower end of the bulb, and pressing upon the same at a point intermediate between the ends of the spring-arms and the points where they join the main body of the metal.

8. The combination with the glass bulb of an inclosed-arc lamp, and a shoulder against which the open end of the said bulb rests, of an elastic support applied to the close end of the bulb, the said elastic support consisting of a group of radial ngers bent over toward each other and pressing against the bulb at points other than the terminals of the fingers.

9. The combination with the trim-plate of an inclosed-arc lamp, and the gas-check therefor, of a cam-lock connection between the parts named.

10. The combination with the trim-plate of an inclosed-arc lamp, of a detachable lower lamp structure connected with the gas-check.

11. The combination with the trim-plate of an inclosed-arc lamp, of a lower lamp structure connected to a suitable gas-check and means for detachably securing the gas-check to the trim-plate.

12. The combination, in an inclosed-arc lamp, of a gas-check, a support for the lower carbon joined to the gas-check, a trim-plate and means for detachably securing the gascheck to the trim-plate.

13. In an inclosed-arc lamp, a suitable gas-V check and a lower-carbon support permanently secured thereto.

14. In an inclosed-arc lamp, a suitable gascheck, a support for the lower carbon permanently attached thereto, a trim-plate and a cam-lock connectionbetween the gas-check and the trim-plate.

Signed at New York, in the countyof New York and State of New York, this 27th day of August, A. D. 1900.

l PHILIP LUHR.

Witnesses:

WM. H. CAPEL, GEORGE I-I. STOCKBRIDGE.

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